The Stay With Me singer cancelled a string of Australian dates last month after doctors discovered a haemorrhage on them and he was flown to the United States to see a specialist.

He told t he BBC Radio 1 Breakfast Show with Nick Grimshaw that the problem was caused by "singing too hard for too long".

He said t he last few weeks had been "horrendous" after doctors banned him from speaking while he recovered, adding: "I ha ven't properly sung yet, I've just been singing in the shower and stuff.

"I'm just trying to take it slow".

The singer has had a meteoric rise in the last few years. Sales figures released last month show he had the best-selling album, single and most streamed track by a British artist in the US in 2014 when Stay With Me was played more than 147 million times